extinct

adj. nonexistent; vanished, dead

In biology and ecology, extinction is the cessation of existence of a species or group of taxa, reducing biodiversity. The moment of extinction is generally considered to be the death of the last individual of that species (although the capacity to breed and recover may have been lost before this point). Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "re-appears" (typically in the fossil record) after a period of apparent absence.
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Adjective
1. no longer in existence; lost or especially having died out leaving no living representatives; "an extinct species of fish"; "an extinct royal family"; "extinct laws and customs"
(synonym) nonextant
(antonym) extant
(similar) dead
(see-also) nonexistent
2. of e.g. volcanos; permanently inactive; "an extinct volcano"
(synonym) inactive
(antonym) active
(similar) dead
(attribute) extinction
3. of a fire; being out or having grown cold; "threw his extinct cigarette into the stream"; "the fire is out"
(synonym) out(p)
(similar) dead

(v. t.)
To cause to be extinct.
  

(a.)
Without a survivor; without force; dead; as, a family becomes extinct; an extinct feud or law.
  

(a.)
Extinguished; put out; quenched; as, a fire, a light, or a lamp, is extinct; an extinct volcano.
  

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Hanging by a thread.
Very precious. Almost extinct. Also referring to sounds that linger on faintly.